CN108834300B - Extraction magnet passage first harmonic in superconducting cyclotron has a snack device and method - Google Patents
Extraction magnet passage first harmonic in superconducting cyclotron has a snack device and method Download PDFInfo
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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Abstract
Magnet passage first harmonic is drawn the invention discloses a kind of superconducting cyclotron and has a snack device, including being laid in the electrostatic deflection plates of superconducting cyclotron constant temperature chamber interior walls along extraction path, drawing magnet passage, compensating element,；Its main feature is that: compensating element, is laid in the suitable position of superconducting cyclotron constant temperature chamber interior walls, for offsetting influence of the harmonic fields to main field caused by drawing magnet passage；It also discloses a kind of method: by motion compensation iron block in different radii, different angle, magnetic field being measured, can be obtained and optimal have a snack position；The present invention compensates shape and the position of original part by changing, produce unexpected technical effect, by when drawing path position appropriate, placing the compensation iron block of suitable dimension, the offset magnetic field that it is generated is almost completely the same with the curve of magnet passage MC2-6 harmonic fields, compensation effect reaches approximately 100%, and the compensation effect of harmonic coil wants much more obvious compared with prior art.
Description
Technical field
The invention belongs to cyclotron fields, and in particular to a kind of superconducting cyclotron extraction magnet passage first harmonic
Have a snack device and shimming method.
Background technique
Field is had a snack whens cyclotron magnet field shim includes equal has a snack with harmonic fields, and field, which is had a snack, whens usually equal relies primarily on magnetic
The change of polar front shape is completed, and without coaxial coil, magnetic pole strength shape is sufficiently complex, and angular breadth changes with radius.
The adjusting of harmonic fields generally relies on the adjusting of harmonic coil to complete.In 100MeV cyclotron magnet field shim, field whens waiting
Have a snack and rely on the panel for being installed at magnetic pole strength both sides with having a snack for harmonic fields and complete, field is had a snack by changing panel whens waiting
Width complete, harmonic fields have a snack by panel asymmetry completion.
230MeV superconducting cyclotron is drawn in design, because the decline of its main magnet fringing field is more slow, to inhibit this
Kind effect, line extraction are generally divided into following steps: adding harmonic coil to introduce harmonic fields so that beam in draw-out area first
Stream generates biggish circle spacing in lead-out area, then as shown in Figure 1, drawing deflecting plates ESD1, ESD2 to last by electrostatic
Circle (magnetic pole outmost turns line) beam bending enters extraction orbit, then after drawing deflecting plates ESD1, ESD2 by extraction orbit electrostatic
The magnet passage (MC1-6) in face guides the line to pass through edge place (extraction orbit guide proton beam rotate counterclockwise).But it is same
Sample brings problem, the introducing of magnet passage, so that passive focus element generates magnetic field, for point of main field while focusing
Cloth produces more apparent influence.
Summary of the invention
Magnet passage first harmonic is drawn in view of the deficiencies of the prior art, the present invention proposes a kind of superconducting cyclotron to have a snack
Device and shimming method, it is therefore intended that eliminate influence of the harmonic fields to main field caused by drawing magnet passage.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of superconducting cyclotron draws magnet passage first harmonic and has a snack device, including along draw path be laid in it is super
It leads the electrostatic deflection plates of cyclotron constant temperature chamber interior walls, draw magnet passage, compensating element,；Its main feature is that: in superconducting cyclotron plus
Compensating element, is laid in the fast suitable position of device constant temperature chamber interior walls, for offsetting harmonic fields caused by drawing magnet passage to main field
It influences.
The extraction path is superconducting cyclotron Particles Moving path, under normal circumstances, by Lip river under magnetic field environment
Hereby power acts on for human relations, circles inside cyclotron, after electrostatic deflection plates, cation is by electric field deflecting force
Effect deviates original route and moves to extraction channel direction.
The superconducting cyclotron draws path and is disposed with annular magnet yoke from outside to inside, annular thermostatic chamber, draws
Magnet passage, electrostatic deflection plates；The superconducting cyclotron is additionally provided with logical through annular magnet yoke and the extraction of annular thermostatic chamber
Road, the extraction channel are poroid channel physically, and end, the outlet end of magnet passage are drawn in the arrival end connection in poroid channel
Stretch out annular magnet yoke edge.
The electrostatic deflection plates are two pieces, which is to be laid in superconducting cyclotron respectively to draw road
Electric field arrangement between the Liang Ge adjacent peak area of diameter leading point, radian is consistent with path curvatures are drawn, electrostatic deflection plates positive and negative anodes
Between form uniform electric field deflecting force generated to cation, be brought out so that cation be made to deviate former motion path.
The extraction magnet passage is formed by being laid in multiple concentrating elements spaced apart on extraction path, including
MC1, MC2, MC3, MC4, MC5, MC6, shape is cuboid band installation pedestal structure, and is alongst had inside it
Empty slot, the installation pedestal of side end face are fixed in annular constant greenhouse inwall.
The hollow groove is equipped with three blocks of magnet in alongst, is laid in bottom, left wall, the right side of hollow groove respectively
Wall is focused by the thickness and height of regulating magnet.
The compensating element, includes C1, C2 compensation iron block, and wherein C2 compensates iron block for compensating other five in addition to MC1
The harmonic fields that concentrating element generates influence；
The compensation iron block is rectangle, and length size is respectively as follows: 12cm, 2cm, 1.8cm；The compensation iron block is solid
In annular constant greenhouse inwall and along the diameter of spiral shape magnetic pole, symmetrical with concentrating element.
A kind of superconducting cyclotron extraction magnet passage first harmonic has a snack the shimming method of device, its main feature is that: including
Following steps:
Step 1: the scale that fringing field defocuses line is calculated, to design concentrating element；
Step 2: inhibiting fringing field effect by adjusting concentrating element parameter；
Magnet passage structure is drawn Step 3: determining according to fringing field distribution situation；
Step 4: motion compensation iron block, obtains and has a snack radius and angle, and radius where analyzing compensation iron block, angle and
Compensate the contribution of iron block geomery.
Step 5: adjusting compensation iron block compensates impact factor, effect is had a snack in optimization.
Step 6: placing the compensation iron block block of suitable size, while movable mechanism is installed additional for compensation iron block.
Step 7: being measured in different radii, different angle to magnetic field by motion compensation iron block, verifying calculates knot
Fruit changes compensation iron block size, repeated authentication work later.
Step 8: being analyzed by measurement data, if completely eliminate magnet passage concentrating element to the first harmonic of main field
It influences, when elimination, then can be obtained and optimal have a snack position.
Advantages of the present invention effect
1, the prejudice the present invention overcomes those skilled in the art for a long time adds harmonic coil to realize humorous in draw-out area
The conventional method that wave field is had a snack, with compensation iron block+azimuth replace traditional harmonic coil, do so, that is, be utilized iron block with
Harmonic coil is ferromagnetic material, the general character that can generate offset magnetic field, and it is many and diverse to overcome harmonic coil manufacture craft
Deficiency, specific advantage are as follows: harmonic coil is compared to compensation iron block, the former needs through complicated calculations, and manufacturing process is many and diverse, work
Skill requires height, causes the period long, at high cost；The latter does not need complicated calculating, does not need to carry out the coiling of coil, do not need to adopt
With complicated technique, it is only necessary to make various sizes of iron block, and it is put into respectively and draws path position appropriate, pass through reality
It tests, obtains the size of different length iron blocks and the compensation effect data of different direction angle, therefrom select compensation effect
The size of one group of optimal iron block and iron block put azimuth, and whole efficiency improves very much.
2, the present invention compensates shape and the position of original part by changing, and produces unexpected technical effect, passes through reality
Verify it is bright, when drawing path position appropriate, placing the compensation iron block of suitable dimension, the offset magnetic field generated almost and
The curve of magnet passage MC2-6 harmonic fields is completely the same, compensation effect reaches approximately 100%, compared with prior art harmonic coil
Compensation effect wants much more obvious.
Detailed description of the invention
Fig. 1 is that cyclotron draws layout；
Fig. 2 is that concentrating element MCn is installed on annular constant greenhouse inwall schematic diagram；
Fig. 3 is that three pieces of magnet schematic diagrames are laid in concentrating element MCn hollow groove；
Fig. 4 is three pieces of magnet size schematic diagrames in adjustment concentrating element MCn；
Fig. 5 is that compensating element, Cn is installed on annular constant greenhouse inwall schematic diagram；
Fig. 6 is compensating element, Cn schematic shapes；
Fig. 7 is the harmonic component of concentrating element MC2-6 generation with the distribution map of radius；
Fig. 8 is distribution map of the first harmonic phase that generates in accelerator of concentrating element MC2-6 with radius；
In figure, 1: magnetic yoke；2, annular thermostatic chamber；3-1,3-2,3-3,3-4: spiral magnetic pole；ESD1, ESD2: electrostatic is inclined
Rotating plate；C1, C2: compensation iron block；MC1, MC2, MC3, MC4, MC5, MC6: concentrating element；4: extraction channel；5: high-voltage electricity grade；6:
Heat dissipation pipe.
Specific embodiment
With reference to the accompanying drawing, a specific embodiment of the invention is described in further detail.
Inventive principle
1, magnet passage concentrating element harmonic component has an impact analysis for main field.It is illustrated in figure 7 magnet passage focusing
Element MC2-6 generated each harmonic component profile in accelerator, the bold line in three curves are average value curve,
Abscissa is radius R, that is, concentrating element from the accelerator center of circle to the radial location of annular thermostatic chamber, and ordinate is that magnetic field is strong
Degree, as can be seen from Figure 7, as radius R increases, harmonic field intensity is consequently increased, and the magnetic field good general of this harmonic fields can be direct
Influence the main field of accelerator.The object of the invention is to balance out the harmonic fields amplitude of Fig. 7, one and Fig. 7 is specially generated
The magnetic field of the same opposite direction, to offset the harmonic fields of Fig. 7.
2, magnet passage concentrating element harmonic phase has an impact analysis for main field.Magnet passage concentrating element first harmonic
Phase as shown in figure 8, phase distribution between 200 degree to 250 degree, therefore can by between 200 degree to 250 degree some
One piece of rectangular compensation iron block is placed in azimuth position, and adjust its radial position and size to generate it in accelerator primary
Harmonic amplitude distribution is consistent with curve in Fig. 7.
3, it is not very sensitive for compensating the radial position of iron block and the size of first harmonic.The radial position is also
It is radial location, the variation of the size of first harmonic is not obvious compared to the size of iron block and azimuth, for example, working as
The amplitude difference variation of iron block first harmonic at radius r=91.0,92.0, the position 93.0cm is unobvious, therefore, compensates iron block
Radius be laid in the inner wall of annular thermostatic chamber and can meet the requirements.
Based on the above inventive principle, the present invention, which devises a kind of superconducting cyclotron and draws magnet passage first harmonic, to be had a snack
Device and method.
A kind of superconducting cyclotron draws magnet passage first harmonic and has a snack device, as shown in Figure 1, including along drawing road
Diameter is laid in the electrostatic deflection plates (ESD1, ESD2) of superconducting cyclotron constant temperature chamber interior walls, draws magnet passage (MC1-6), mends
Repay element (C1, C2)；Its main feature is that: compensating element, is laid in the suitable position of superconducting cyclotron constant temperature chamber interior walls, is used for
Offset influence of the harmonic fields to main field caused by drawing magnet passage.
The extraction path is superconducting cyclotron Particles Moving path, under normal circumstances, by Lip river under magnetic field environment
Hereby power acts on for human relations, circles inside cyclotron, after electrostatic deflection plates, cation is by electric field deflecting force
Effect deviates original route and moves to extraction channel direction.
As shown in Figure 1, the superconducting cyclotron draws path is disposed with annular magnet yoke 1, annular from outside to inside
Thermostatic chamber 2 draws magnet passage (MC1-6), electrostatic deflection plates (ESD1, ESD2)；The superconducting cyclotron, which is additionally provided with, to be passed through
The extraction channel 4 of annular magnet yoke and annular thermostatic chamber is worn, which is poroid channel physically, and poroid channel enters
The terminal M C6 of magnet passage is drawn in the connection of mouth end, the edge of annular magnet yoke 1 is stretched out in outlet end.
The electrostatic deflection plates are two pieces of ESD1, ESD2, which is to be laid in superconducting cyclotron respectively to add
Fast device draws the electric field arrangement between path leading point Liang Ge adjacent peak area, and radian is consistent with path curvatures are drawn, and electrostatic is inclined
The positive and negative interpolar of rotating plate forms uniform electric field and generates deflecting force to cation, is brought out so that cation be made to deviate former motion path.
As shown in Figure 1 and Figure 2, the magnet passage of drawing is by being laid in multiple focusing spaced apart on extraction path
Element composition, including MC1, MC2, MC3, MC4, MC5, MC6, shape are cuboid band installation pedestal MCn-1 structure, and in it
Portion alongst has hollow groove MCn-2, the installation pedestal MCn-1 of side end face to be fixed on annular 2 inner wall of thermostatic chamber.
As shown in figure 3, the hollow groove MCn-2 be equipped in alongst three blocks of magnet (MCn-3-1, MCn-3-2,
MCn-3-3), it is laid in bottom, the left wall, right wall of hollow groove MCn-2 respectively.
As shown in figure 4, the thickness and height by adjusting three blocks of magnet are focused, so that optimum focusing effect is generated,
The effect is as shown in phantom in figure 4: when three blocks of magnet thickness, be highly adjusted to w=0.3cm, h=0.8cm, H=
When 1.25cm, the sine curve that gradient fields generate passes through three blocks of magnet, also, the circular radius r=between three blocks of magnet just
0.6cm.It wherein, is highly the height upward as starting point from Y=0 point.
As shown in Figure 1, the compensating element, Cn includes C1, C2 compensation iron block, wherein C2 compensates iron block and removes MC1 for compensating
The harmonic fields that other five concentrating elements generate in addition influence；
The harmonic fields that C1 compensation iron block is used to compensate the generation of MC1 concentrating element influence, and C1, which compensates MC1 harmonic fields, to be influenced, no
As the content of present invention, do not elaborate herein.
As shown in Figure 5, Figure 6, the compensation iron block Cn be rectangle, length size be respectively as follows: 12cm, 2cm,
1.8cm；Compensation iron block Cn is packed in annular constant greenhouse inwall 2.Iron block is laid as shown in Figure 1, along spiral shape magnetic pole
It is diameter, symmetrical with screw type magnetic pole.
Test proves: when the length size for compensating the fast C2 of iron is respectively as follows: 12cm, 2cm, 1.8cm and when compensation
Between 200 degree to 250 degree when some azimuth position, the first harmonic generated in accelerator shakes the phase of iron block C2
Width distribution is consistent with curve in Fig. 7, and thus amplitude direction is on the contrary, balance out concentrating element MC2-6 first harmonic for main magnetic
The influence of field.
Supplementary explanation:In Fig. 1, four magnetic poles are respectively 3-1,3-2,3-3,3-4, wherein C1 and 3-3 magnetic pole symmetrically divides
Cloth, C2 and 3-4 magnetic pole are symmetrical.
A kind of superconducting cyclotron extraction magnet passage first harmonic has a snack the shimming method of device, it is characterised in that: packet
Include following steps:
Step 1: the scale that fringing field defocuses line is calculated, to design concentrating element；
Supplementary explanation:
Fringing field is the distribution situation in magnet excitation back edge magnetic field；
Drawing path is the paths traversed in cation spill process, generally real by physical computing and Machine Design
Now artificial interference reaches required path.
Step 2: inhibiting fringing field effect by adjusting concentrating element parameter；
Magnet passage structure is drawn Step 3: determining according to fringing field distribution situation；
Step 4: motion compensation iron block, obtains and has a snack radius and angle, and radius where analyzing compensation iron block, angle and
Compensate the contribution of iron block geomery.
Step 5: adjusting compensation iron block compensates impact factor, effect is had a snack in optimization.
Step 6: placing the compensation iron block block of suitable size, while movable mechanism is installed additional for compensation iron block block.
Step 7: being measured in different radii, different angle to magnetic field by motion compensation iron block, verifying calculates knot
Fruit changes compensation iron block size, repeated authentication work later.
Step 8: being analyzed by measurement data, if completely eliminate magnet passage concentrating element to the first harmonic of main field
It influences, when elimination, then can be obtained and optimal have a snack position.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore the present invention is simultaneously
It is not limited to embodiment described in specific embodiment, it is all to be obtained according to the technique and scheme of the present invention by those skilled in the art
Other embodiments, also belong to the scope of protection of the invention.
Claims (5)
1. a kind of superconducting cyclotron draws magnet passage first harmonic and has a snack device, including is laid in superconduction along path is drawn
The electrostatic deflection plates of cyclotron constant temperature chamber interior walls draw magnet passage, compensating element,；It is characterized by: adding in superconducting cyclotron
Compensating element, is laid in the fast suitable position of device constant temperature chamber interior walls, for offsetting harmonic fields caused by drawing magnet passage to main field
It influences；
The extraction magnet passage is formed by being laid in multiple concentrating elements spaced apart on extraction path, including MC1,
MC2, MC3, MC4, MC5, MC6, shape is cuboid band installation pedestal structure, and is alongst had inside it hollow
Slot, the installation pedestal of side end face are fixed in annular constant greenhouse inwall；
The hollow groove is equipped with three blocks of magnet in alongst, is laid in bottom, the left wall, right wall of hollow groove respectively, leads to
The thickness and height for overregulating magnet are focused；
The compensating element, includes C1, C2 compensation iron block, and wherein C2 compensates iron block for compensating other five focusing in addition to MC1
The harmonic fields that element generates influence；
The compensation iron block C2 is rectangle, and length size is respectively that can completely eliminate magnet passage concentrating element to master
The size that the first harmonic in magnetic field influences；The compensation iron block is packed in annular constant greenhouse inwall and along spiral shape magnetic pole
It is diameter, symmetrical with concentrating element.
2. a kind of superconducting cyclotron draws magnet passage first harmonic and has a snack device according to claim 1, feature exists
In: the extraction path is superconducting cyclotron Particles Moving path, is acted on, is circling round by Lorentz force under magnetic field environment
Circled inside accelerator, after electrostatic deflection plates, cation by electric field deflecting force act on deviate original route to
The movement of extraction channel direction.
3. a kind of superconducting cyclotron draws magnet passage first harmonic and has a snack device according to claim 1, feature exists
In: the superconducting cyclotron draws path and is disposed with annular magnet yoke, annular thermostatic chamber, extraction magnetic flux from outside to inside
Road, electrostatic deflection plates；The superconducting cyclotron is additionally provided with the extraction channel through annular magnet yoke and annular thermostatic chamber, should
Extraction channel is poroid channel physically, and the end of magnet passage is drawn in the arrival end connection in poroid channel, outlet end is stretched out
Annular magnet yoke edge.
4. a kind of superconducting cyclotron draws magnet passage first harmonic and has a snack device according to claim 1, feature exists
In: the electrostatic deflection plates are two pieces, which is to be laid in superconducting cyclotron extraction path respectively to draw
Electric field arrangement between Chu Dianliangge adjacent peak area, radian is consistent with path curvatures are drawn, the positive and negative interpolar shape of electrostatic deflection plates
Deflecting force is generated to cation at uniform electric field, is brought out so that cation be made to deviate former motion path.
5. a kind of -4 superconducting cyclotrons of any one draw magnet passage first harmonic and have a snack device according to claim 1
Shimming method, it is characterised in that: the following steps are included:
Step 1: the scale that fringing field defocuses line is calculated, to design concentrating element；
Step 2: inhibiting fringing field effect by adjusting concentrating element parameter；
Magnet passage structure is drawn Step 3: determining according to fringing field distribution situation；
Step 4: motion compensation iron block, obtains and have a snack radius and angle, and analyze radius, angle and compensation where compensation iron block
The contribution of iron block geomery；
Step 5: adjusting compensation iron block compensates impact factor, effect is had a snack in optimization；
Step 6: placing the compensation iron block of suitable size, while movable mechanism is installed additional for compensation iron block；
Step 7: measuring in different radii, different angle to magnetic field by motion compensation iron block, calculated result is verified, it
Change compensation iron block size, repeated authentication work afterwards；
Step 8: being analyzed by measurement data, if completely eliminating magnet passage concentrating element influences the first harmonic of main field,
When elimination, then it can be obtained and optimal have a snack position.
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| CN201810682648.XA CN108834300B (en) | 2018-06-27 | 2018-06-27 | Extraction magnet passage first harmonic in superconducting cyclotron has a snack device and method |
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| CN108834300B true CN108834300B (en) | 2019-09-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005285448A (en) * | 2004-03-29 | 2005-10-13 | National Cardiovascular Center | Particle accelerator |
| CN106068055A (en) * | 2015-04-22 | 2016-11-02 | 住友重机械工业株式会社 | Cyclotron and superconducting magnet |
| CN205883691U (en) * | 2016-07-29 | 2017-01-11 | 中国原子能科学研究院 | Subminiature magnet passage suitable for 200 beam ejection of superconductive proton cyclotron of 250MeV |
| CN106804091A (en) * | 2017-03-21 | 2017-06-06 | 华中科技大学 | A kind of cyclotron isochronous magnetic field shimming method and system |
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2018
- 2018-06-27 CN CN201810682648.XA patent/CN108834300B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005285448A (en) * | 2004-03-29 | 2005-10-13 | National Cardiovascular Center | Particle accelerator |
| CN106068055A (en) * | 2015-04-22 | 2016-11-02 | 住友重机械工业株式会社 | Cyclotron and superconducting magnet |
| CN205883691U (en) * | 2016-07-29 | 2017-01-11 | 中国原子能科学研究院 | Subminiature magnet passage suitable for 200 beam ejection of superconductive proton cyclotron of 250MeV |
| CN106804091A (en) * | 2017-03-21 | 2017-06-06 | 华中科技大学 | A kind of cyclotron isochronous magnetic field shimming method and system |
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